At his plea hearing, the 71-year-old acknowledged he encouraged a "naked dance party" in which boys danced in the shower. He also apologized.

Seibel taught drama at Shattuck-St. Mary's from 1992 to 2003 and lived in one of the dormitories. He left in 2003 after child pornography was found on his computer. He was working as an actor in California before his arrest last year.

Prosecutors are seeking 52 months in prison, followed by probation, at Friday's sentencing.